Just got a corel update: here are the tweaks. "The patch includes new mapping modes such as Sinusoidal, World Front, World Side, World Cubic and Object Cubic. New import/export filters are also featured in Bryce 4.1, including X (DirectX 3D), the Microsoft 3D file format used primarily by game designers. The new patch also introduces Custom Starfields, which can be used to represent the stars visible from earth. Until now, starfields in Bryce were only able to be generated randomly"